C#R485 串口通讯

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Com_zhx
{
    public partial class Form1 : Form
    {
        #region**参数设置**
        private static SerialPort sp = null;
        private static Boolean isSetProperty = false;
        private static String[] rates = { "2400", "4800", "9600", "19200", "38400", "43000", "56000", "57600", "115200"};
        private static String[] paritys = { "None", "奇校验", "偶校验" };
        private static String[] dataBits = { "5", "6", "7", "8" };
        private static String[] stopBits = { "0","1", "1.5","2" };
        #endregion
        #region**初始化**
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)

        {
            //加载所有
            //Com_zhx.Profile.SaveProfile();
            Com_zhx.Profile.LoadProfile();
            DTR.Enabled = false;
            RTS.Enabled = false;
            //加载可用串口，波特率，校验位，数据位，停止位
            SearchPort();
            Load_Rate();
            Load_Parity();
            Load_DataBits();
            Load_StopBits();
            Auto_SenT_Initialize();
        }
        #endregion

        #region**搜索串口按钮**
        private void Search_ComPort_Click(object sender, EventArgs e)
        {
            SearchPort();
        }
        #endregion
        #region**开关串口**
        private void Open_Port_Click(object sender, EventArgs e)
        {
            if (RS485.Checked)
            {
                Open_Port_485();
            }
            else